Inflammatory bowel disease (IBD) is characterized by recurrent abdominal pain, diarrhea, and mucopurulent bloody stools as its main clinical manifestations. In recent years, its parenteral manifestations have received increasing attention. Fatigue, as one of the extraintestinal manifestations of IBD, affects the quality of life of patients, and results in considerable distress for patients. The influencing factors of fatigue symptoms in IBD patients include inflammation, psychological comorbidities, sleep disorders, anemia, micronutrient deficiency, changes in microbiota, and metabolomics. The pathogenesis is currently unclear and may be related to disorders in tryptophan metabolism. This article will review the influencing factors and pathogenesis of fatigue symptoms in IBD patients, aiming to provide a basis for the prevention and treatment of IBD fatigue.